Overview of router bits: 3mm shank. These cutters are made of high speed steel for high hardness and long life. Very convenient for your daily woodworking. The blades slice smoothly into the teeth for a clean, splinter-free result. Material: Our router bits are made of solid hardened steel and micro-grain C3 carbide. Grade carbide (C3 is the highest level used in the router bit industry). Precise product design creates smooth, detailed cuts that are perfect for any level of intricacy.Perfect Design: Solid hardened steel body with anti-kickback design. Balance of +/- 0.25" tolerance (allowing smooth operation at high RPM speeds), C3 carbide tipped - Micro grain grade provides increased strength and maximum strength. [Wide Uses]: Router tools can cut through most materials including copper, aluminum, other soft metals, ABS, acrylic, PVC, nylon, resin, most plastics, wood, fiberglass, etc. Suitable for handcrafting or other woodworking, can be used to join wood edge to edge or to . Perfect choice for professionals and amateurs.Where to use it: Ten cookie cutters in different shapes and sizes, typically used on electric mowers for wood cutting, milling and other processing. Note: the data are all manual measurement, please allow 1 - 49cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received.